Lucozade sport

I’m nearly 12 weeks pp from a section and since my first period around 5 weeks I’ve been suffering with really bad fainty/dizzy spells. I wash drinking water and eating but nothing helped. Had a blood test and nothing came up bad. I started drinking Lucozade sport everyday for 2 weeks now and it helped massively! 3 days ago I noticed my throat started feeling weird? As if my tongue was swollen but wasn’t? My uvula is swelled up too, I do suffer with reflux as well but not that bad for medication. I haven’t had a Lucozade today as I thought it could be that but I’m now feeling dizzy and have a horrible headache. I’m lost what to do tbh